abstract angle angles appearance architectural architecture background barrier basic brick brick-wall bricks brickwork color colored colors colour coloured colours exterior external perspective perspectives rough smooth solid standard strength surface surfaces texture textured textures uneven variation varied various wall wallpaper wood wooden woodwork building cement firm mortar traditional-brick-wall backdrop coloring colouring constructed linear lines rectangular secure security strong style surfaced walled well-buil well-built building-material composite distinctive old rectangles symmetry